issues after porting a mac app from Java 6 to 7u9 (original) (raw)

Srinivas Ramakrishna ysr1729 at gmail.com
Tue Nov 13 01:24:44 PST 2012

Correction inline below:

On Tue, Nov 13, 2012 at 1:23 AM, Srinivas Ramakrishna <ysr1729 at gmail.com>wrote:

On Mon, Nov 12, 2012 at 6:54 AM, Rick Hillegas <rick.hillegas at oracle.com>wrote: ...

2) The other problem is probably too vague, but here goes: I seem to have memory management issues. After running the app for a while, it starts freezing up and I watch the beachball spin. Eventually the app becomes unusable and I have to re-start it. Is it expected that I will need to give an app more memory in order to run it on Java 7?

The default GC with JDK 6 on the Mac was -XX:+UseConcMarkSweepGC. With JDK 7 it is -XX:+UseParallelGC.

Actually -XX:+UseParallelOldGC (not just -XX:+UseParallelGC).

-- ramki

I suspect the JDK 6 version that was the default on your mac, also used a different default heap size. The combination of a different heap size and a different collector (but especially a different heap size) could make a big difference in performance (especially if you were running lots of other stuff on your mac, so that the Java heap was paging during full gc).

As others have indicated, verbose gc logs are your friend. -- ramki

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